US4469525A — Membrane remover/etchant

Claim 1

Independent Claim 103 words

A process for preparing a membrane containing concrete surface for application of a coating, said process comprising applying to said concrete surface a mixture including by weight 1 to 10 parts organic solvent having a KB value of at least 89, 30 to 50 parts co-solvent, 1 to 5 parts acid stable surfactant and 25 to 50 parts inhibited acid wherein said organic solvent disintegrates the membrane; subsequently, adding water to said mixture on said surface to activate said acid, permitting said mixture and water to act on said surface to etch said surface and removing said mixture and water from said surface.

Claim 2

Dependent Claim 103 words

A process for preparing a membrane containing concrete surface for application of a coating, said process comprising applying to said concrete surface a mixture including by weight 1 to 10 parts organic solvent having a KB value of at least 89, 30 to 50 parts co-solvent, 1 to 5 parts acid stable surfactant and 25 to 50 parts inhibited acid wherein said organic solvent disintegrates the membrane; subsequently, adding water to said mixture on said surface to activate said acid, permitting said mixture and water to act on said surface to etch said surface and removing said mixture and water from said surface.

Claim 3

Dependent Claim 24 words

The process of claim 1 wherein said water is added in an amount of about 1 to 2 parts water to 1 part mixture.

Claim 4

Dependent Claim 48 words

The process of claim 1 wherein an additional amount of aromatic solvent having a KB value of at least 89 is added to said mixture prior application to said surface, said aromatic solvent being added in an amount of about 1 part aromatic solvent to 1 part mixture.

Claim 5

Dependent Claim 14 words

The process of claim 1 wherein said organic solvent is a chlorinated hydrocarbon solvent.

Claim 6

Dependent Claim 11 words

The process of claim 4 wherein said solvent is methylene chloride.

Claim 7

Dependent Claim 107 words

A process for removing a membrane from a concrete surface and etching said surface, said process comprising: applying a solution to said membrane, said solution comprising by weight, 1 to 10 parts chlorinated hydrocarbon solvent, 30 to 50 parts co-solvent, 1 to 5 parts acid stable surfactant, 5 to 20 parts weak organic acid, 20 to 30 parts strong acid, and up to 100 parts aromatic solvent; working said solution on said membrane to disintegrate said membrane; subsequently adding water in an amount sufficient to activate said strong and weak acids to etch said concrete surface; and removing said solution and disintegrated membrane materials from said surface.

Claim 8

Dependent Claim 107 words

A process for removing a membrane from a concrete surface and etching said surface, said process comprising: applying a solution to said membrane, said solution comprising by weight, 1 to 10 parts chlorinated hydrocarbon solvent, 30 to 50 parts co-solvent, 1 to 5 parts acid stable surfactant, 5 to 20 parts weak organic acid, 20 to 30 parts strong acid, and up to 100 parts aromatic solvent; working said solution on said membrane to disintegrate said membrane; subsequently adding water in an amount sufficient to activate said strong and weak acids to etch said concrete surface; and removing said solution and disintegrated membrane materials from said surface.

Claim 9

Dependent Claim 21 words

The process of claim 4 wherein said water is added at a ratio of 2 parts water to 1 part solution.

Claim 10

Dependent Claim 63 words

A process for preparing a membrane containing concrete surface for application of a coating, said process comprising applying to said concrete surface a mixture including a solvent and an inhibited acid, said solvent being capable of disintegrating the membrane covering the concrete surface, subsequently activating said acid to etch said concrete surface and then removing said mixture and disintegrated membrane from said surface.

Claim 11

Dependent Claim 63 words

A process for preparing a membrane containing concrete surface for application of a coating, said process comprising applying to said concrete surface a mixture including a solvent and an inhibited acid, said solvent being capable of disintegrating the membrane covering the concrete surface, subsequently activating said acid to etch said concrete surface and then removing said mixture and disintegrated membrane from said surface.

Claim 12

Dependent Claim 30 words

The process of claim 8 wherein said solvent is of a type suitable for removal of membranes selected from the group consisting of chlorinated rubber, oleo resins and acrylic resins.

Claim 13

Dependent Claim 12 words

The process of claim 8 wherein said solvent comprises a chlorinated hydrocarbon.

Claim 14

Dependent Claim 44 words

The process of claim 10 wherein said solvent further includes a cosolvent, said cosolvent being compatible with both said chlorinated hydrocarbon and said acid, said solvent serving to inhibit the ionization of said acid, said acid being subsequently activated by the addition of water.

Claim 15

Dependent Claim 25 words

The process of claim 11 wherein said chlorinated hydrocarbon is a member of the group consisting of ethylene dichloride, trichloroethylene, propylene dichloride, perchloroethylene and o-dichlorobenzene.

Claim 16

Dependent Claim 24 words

The process of claim 8 wherein said solvent includes a non-chlorinated solvent selected from the group consisting of naphtha, benzene, ethylbenzene, toluene, and xylene.

Claim 17

Dependent Claim 75 words

A process for treating a membrane containing concrete surface, said process comprising: applying a mixture comprising a solvent system and an etchant, said solvent system being suitable for removal of said membrane, said etchant being in an inactive state; working said mixture on said membrane containing concrete surface to disintegrate said membrane and expose said concrete surface; subsequently activating said etchant to thereby etch said concrete surface; and removing said disintegrated membrane and used mixture.

Claim 18

Dependent Claim 75 words

A process for treating a membrane containing concrete surface, said process comprising: applying a mixture comprising a solvent system and an etchant, said solvent system being suitable for removal of said membrane, said etchant being in an inactive state; working said mixture on said membrane containing concrete surface to disintegrate said membrane and expose said concrete surface; subsequently activating said etchant to thereby etch said concrete surface; and removing said disintegrated membrane and used mixture.

Claim 19

Dependent Claim 30 words

The process of claim 14 wherein said mixture comprises an organic solvent, a cosolvent and a strong ionizable acid etchant dissolved in said solvent, said mixture being compatible with water.

Claim 20

Dependent Claim 20 words

The process of claim 15 wherein said acid etchant is activated by adding sufficient water to ionize said acid etchant.

Claim 21

Dependent Claim 19 words

The process of claim 16 wherein said mixture further includes an acid stable surfactant and a weak organic acid.

Claim 22

Dependent Claim 20 words

The process of claim 15 wherein said mixture has sufficiently low water content to inhibit ionization of said acid etchant.

Claim 23

Dependent Claim 62 words

A process for removing a coating from a concrete surface, said process comprising applying a coating remover/etchant solution to said coated concrete, said solution including an inhibited acid etchant and an organic solvent, said solvent being capable of disintegrating said coating while inhibiting said acid, subsequently activating said acid to etch said concrete and removing said disintegrated coating and said used solution.

Claim 24

Dependent Claim 62 words

A process for removing a coating from a concrete surface, said process comprising applying a coating remover/etchant solution to said coated concrete, said solution including an inhibited acid etchant and an organic solvent, said solvent being capable of disintegrating said coating while inhibiting said acid, subsequently activating said acid to etch said concrete and removing said disintegrated coating and said used solution.

Claim 25

Dependent Claim 70 words

A process for preparing a membrane containing concrete surface for application of a coating, said process comprising applying to said concrete surface a mixture including a solvent and an inhibited acid, said solvent being compatible with water and adapted to disintegrate the membrane covering the concrete surface, subsequently activating said acid and etching said concrete surface with said acid and then removing said mixture and disintegrated membrane from said surface.

Claim 26

Dependent Claim 70 words

A process for preparing a membrane containing concrete surface for application of a coating, said process comprising applying to said concrete surface a mixture including a solvent and an inhibited acid, said solvent being compatible with water and adapted to disintegrate the membrane covering the concrete surface, subsequently activating said acid and etching said concrete surface with said acid and then removing said mixture and disintegrated membrane from said surface.

Claim 27

Dependent Claim 48 words

The process of claim 20 wherein said solvent includes a chlorinated hydrocarbon solvent and a cosolvent, said cosolvent being compatible with both said chlorinated hydrocarbon and said acid, said solvent serving to inhibit the ionization of said acid, said acid being subsequently activated by the addition of water.

Claim 28

Dependent Claim 16 words

The process of claim 20 wherein said solvent has a KB value of at least 89.

Claim 29

Dependent Claim 12 words

The process of claim 20 wherein said solvent is an aromatic solvent.

Claim 30

Dependent Claim 96 words

A process for treating a membrane containing concrete surface, said process comprising: applying a mixture comprising a solvent system including an organic solvent and a cosolvent, and a strong ionizable acid etchant dissolved in said solvent system, said mixture being compatible with water, said solvent system being suitable for removal of said membrane, said etchant being in an inactive state; working said mixture on said membrane containing concrete surface to disintegrate said membrane and expose said concrete surface; subsequently activating said etchant to thereby etch said concrete surface; and removing said disintegrated membrane and used mixture.

Claim 31

Dependent Claim 96 words

A process for treating a membrane containing concrete surface, said process comprising: applying a mixture comprising a solvent system including an organic solvent and a cosolvent, and a strong ionizable acid etchant dissolved in said solvent system, said mixture being compatible with water, said solvent system being suitable for removal of said membrane, said etchant being in an inactive state; working said mixture on said membrane containing concrete surface to disintegrate said membrane and expose said concrete surface; subsequently activating said etchant to thereby etch said concrete surface; and removing said disintegrated membrane and used mixture.

Claim 32

Dependent Claim 20 words

The process of claim 24 wherein said acid etchant is activated by adding sufficient water to ionize said acid etchant.

Claim 33

Dependent Claim 32 words

The process of claim 24 wherein said mixture further includes an acid stable surfactant and a weak organic acid, said weak organic acid acting as an inhibitor for said strong acid etchant.

Claim 34

Dependent Claim 31 words

The process of claim 24 wherein said strong acid etchant is a member of the group consisting of hydrochloric acid, sulfuric acid, nitric acid, sulfurous acid, formic acid and phosphoric acid.

Claim 35

Dependent Claim 28 words

The process of claim 27 wherein said organic solvent is an aromatic solvent and wherein said acid is present in an amount sufficient to etch said concrete surface.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1987-09-04	1988-03-05	1988-09-04	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1991-09-04	1992-03-05	1992-09-04	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1995-09-04	1996-03-05	1996-09-04	$7700.00	Window Closed / Lapsed

Membrane remover/etchant

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